I have 94 e320 and valves are same.

Referencing your first pik. Looking at it left to right
1] Both check valves [bottom ports "Y" connector] get vac from engine manifold
2] Left valve, left port Red line feeds reservoir in right front fender [goes under fan box & battery, susceptible to leaking cracks
3] Left valve, right port Green line goes into firewall feeds ???
4] Right valve, left port Black feeds ???
5] Right valve, right port Black feeds change over valve
6] Change over valve Green feeds Trans Shift Point retard

Re 2] Reservoir out port to ACC controller. You must remove passenger airbag to access it. Easy DIY, but get specific instructions elsewhere in forum.

"Diverter Air Flap" pod located above center vents is probably not working properly allowing warm outside air to mix with cold AC.
Pull the pass air bag and test controller's #6 [2nd from bottom] for Diverter Air Flap.